We've added a new section to the playground called Virtual Labs Express.  The description from the page reads:

These are 30-minute hands-on overviews of some of your favorite Microsoft products and developer tools. Try them out online now - no need to download full trial versions or dedicate test machines. For a more comprehensive evaluation please visit our 90-minute Virtual Labs.

This is something fun and different and gives you an easy way to test out the new technologies. And, yes, half of you will instantly notice that it is currently accessible to IE-only browsers.